mikec03 Posted April 13, 2017 Share Posted April 13, 2017 I have a 2002 Subaru with 105K miles, automatic. I have replaced plugs, ngk, and swapped in oem wires and coil. The car will occasionally hesitate from idle after warmed up. Normally a slight pressure on the peddle will rev the engine from idle to 1000+ rpm instantaneously. One in 10 times it hesitates for 1-2 sec. If the car had the MAF, I would suspect that. But it has the pressure sensor instead. Could the throttle position sensor be a problem? I have had a failure with a 90's TPS, but it set a code, and it wasn't during acceleration anyway. But I assume that the signal from the TPS starts the increased gas injection from idle so I suspect it. No helpful codes of course, except once, a misfire code on 3 cylinders. Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted April 13, 2017 Share Posted April 13, 2017 yeah - I think you can use an ohmmeter to test for smooth TPS transition - but the problem seems little more like a sticking throttle plate??? not sure you may be overdue for a timing belt system service unless it was done in about 2011 or so. Link to comment Share on other sites More sharing options...
Larsen Autoworks Posted April 13, 2017 Share Posted April 13, 2017 Throttle plate sticking? Link to comment Share on other sites More sharing options...
mikec03 Posted April 13, 2017 Author Share Posted April 13, 2017 Throttle plate sticking Yes, I suppose that would account for it. I really cleaned it very well a year ago, but that doesn't mean it's not sticking. I replaced the timing belt and all pulleys 30K miles ago. 1 Link to comment Share on other sites More sharing options...
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